From [1]} we know the three eigenvalues \(k,\theta _{1},\theta _{2}=-\theta _{1}\)  of \(G_f\) . From REF  we get the parameters \(\lambda \)  and \(\mu \) , while REF  allows us to compute \(v=2^{n}=|\mathbb {Z}_{2}^{n}|\) .
